Patent No. EP3309233 (titled "Compositions Comprising Hfc-1234Yf And Hfc-152A") was filed by The Chemours FC on Mar 3, 2006. The application was issued on Feb 21, 2024.

Patent oppositions filed by competitors challenge the validity of a granted patent. These oppositions are typically based on claims of prior art, lack of novelty, or non-obviousness. They are a key part of the process for determining a patent's strength and enforceability.
| Company | Opposition Date | Representative |
|---|---|---|
| MEXICHEM FLUOR DE CV | May 4, 2021 | POTTER CLARKSON |
The dossier documents provide a comprehensive record of the patent's prosecution history - including filings, correspondence, and decisions made by patent offices - and are crucial for understanding the patent's legal journey and any challenges it may have faced during examination.
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